On your heads and that Comp cams... Did you stick with Edelbbrock springs? Because they may be too light in terms of pressures for what the cam wants. However, for first starting, you do not want the heavier dual springs in place if you want your cam to live. So if you are running the correct Comp dual springs on the RPM heads, you should remove the inner spting prior to initial startup, and then reinstall them after the cam's had a chance to break in.